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ICSE Class X Mid-term 2021 : Chemistry

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ST FRANCIS DE SALES PUBLIC SCHOOL Hebbagodi, Electronics City P.O. Bangalore 560100 Std: X MIDTERM EXAMINATION - 2020_Total : 80 Marks CHEMISTRY PAPER - 2 (Two hours) Answers to this paper must be written on the paper provided separately. You will not be allowed to write during first 15 minutes. This time is to be spent in reading the question paper. The time given at the head of this paper is the time allowed for writing the answers. Section I is compulsory. Attempt ANY FOUR questions from Section II. The intended marks for questions or parts of questions are given in brackets []. Section I [40 Marks] Question 1 (a) Choose the most appropriate answer for each of the following (i)An electrolyte which completely dissociates into ions (a) carbonic acid (b) alcohol (c) distilled water (d) sodium hydroxide (ii) The main ore used for the extraction of Aluminium is (a) calamine (b) cryolite (c) haematite (d) bauxite (iii) If the molecular formulae of an organic compound is C12H22. It is (a) alkene (b) alkyne (c) alkane (d) not a hydrocarbon (iv)To increase the pH value of a neutral solution, we should add (a) an acid (b) an acid salt (c) an alkali (d) a salt [5]

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